The invention provides an ultrasonic diagnostic device, consisting in: an ultrasonic probe for transmitting/receiving ultrasonic waves to/from an object to be examined, an ultrasonic image obtaining unit which obtains the ultrasonic image of the object to be examined based on the ultrasonic signal received from the ultrasonic probe, an image recording means for recording volume data of the objectobtained by an image diagnostic device, a position detecting means for detecting 3-dimensional positional information of the ultrasonic probe, and a means for obtaining a tomographic image of the position corresponding to a specified cross-sectional position of the ultrasonic image from the volume data recorded in the image recording means, based on the positional information from the position detecting means; and the ultrasonic diagnostic device is characterized by including a puncture guide member attached to the probe head for guiding the puncture needle and an image display means for displaying the tomographic image which is obtained by the body data and the ultrasonic image of the guide line showing the puncture direction in the case that the puncture needles are inserted at multipleangles.